WO2018131398A1 - Cellule secondaire - Google Patents

Cellule secondaire Download PDF

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Publication number
WO2018131398A1
WO2018131398A1 PCT/JP2017/045558 JP2017045558W WO2018131398A1 WO 2018131398 A1 WO2018131398 A1 WO 2018131398A1 JP 2017045558 W JP2017045558 W JP 2017045558W WO 2018131398 A1 WO2018131398 A1 WO 2018131398A1
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Prior art keywords
electrode
positive electrode
negative electrode
secondary battery
negative
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PCT/JP2017/045558
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English (en)
Japanese (ja)
Inventor
徹 川合
大塚　正博
雄二 水口
Original Assignee
株式会社村田製作所
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Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to CN201780081680.6A priority Critical patent/CN110121797B/zh
Priority to JP2018561883A priority patent/JP6828751B2/ja
Publication of WO2018131398A1 publication Critical patent/WO2018131398A1/fr
Priority to US16/434,353 priority patent/US11411241B2/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H01M10/0418—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes with bipolar electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/045—Cells or batteries with folded plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/562—Terminals characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to a secondary battery.
  • Secondary batteries that can be repeatedly charged and discharged have been used for various purposes.
  • the secondary battery is used as a power source for electronic devices such as smartphones and notebook computers.
  • Patent Document 1 discloses a secondary battery having a step structure. More specifically, in Patent Document 1, It is disclosed that an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, which are constituent elements of a secondary battery, forms a step structure in a cross-sectional view.
  • the inventors of the present application have found that the following problems may occur when a secondary battery including an electrode assembly having a step structure in a cross-sectional view is used. Specifically, the inventors of the present application, when using an electrode assembly having a step structure in a cross-sectional view, is because it is necessary to electrically connect each positive electrode and each negative electrode that are constituent elements thereof. And found that the location of the external terminal is limited.
  • an object of the present invention is to provide a secondary battery capable of avoiding restrictions on the location of external terminals.
  • An electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an electrolyte, and a secondary battery in which an electrolyte is housed
  • the electrode assembly includes a step structure including a first region having a relatively high height in a cross-sectional view and a second region having a relatively low height adjacent to the first region
  • An electrode assembly including a step structure includes a positive electrode side connection tab that connects a part of positive electrode side connection tabs of a part of positive electrodes in a first region, and a negative electrode side connection tab of a part of a negative electrode in the first region.
  • At least one of the negative electrode side connecting portions that connect each other, and at least two positive electrode side extraction tabs of at least two positive electrodes in the second region, and at least two negative electrode At least one of the negative electrode side extraction portions that connect the negative electrode side extraction tabs to each other is configured to be electrically connected to the external terminal.
  • a secondary battery is provided.
  • FIG. 1 is a perspective view schematically showing a secondary battery according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing an electrode assembly having a step structure according to one aspect.
  • FIG. 3 is a cross-sectional view schematically showing an aspect in which the positive electrode side extraction tab and / or the negative electrode side extraction tab located in the second region of the electrode assembly are electrically connected to an external terminal.
  • FIG. 4 is a cross-sectional view schematically showing one aspect of the positive electrode side connection portion that mutually connects the positive electrode side connection tabs located in the first region of the electrode assembly.
  • FIG. 5 is a cross-sectional view schematically showing one aspect of the negative electrode side connection portion that mutually connects the negative electrode side connection tabs located in the first region of the electrode assembly.
  • FIG. 6 is a cross-sectional view schematically showing one aspect of a positive electrode side extraction portion that connects positive electrode side extraction tabs located in the second region of the electrode assembly.
  • FIG. 7 is a cross-sectional view schematically showing one aspect of the negative electrode side extraction portion that mutually connects the negative electrode side extraction tabs located in the second region of the electrode assembly.
  • FIG. 8 is a cross-sectional view schematically showing an electrode assembly having a step structure according to another embodiment.
  • FIG. 9 is a cross-sectional view schematically showing a basic configuration of an electrode assembly having a planar laminated structure.
  • FIG. 10 is a cross-sectional view schematically showing a basic configuration of an electrode assembly having a winding structure.
  • FIG. 11 is a cross-sectional view schematically showing a specific configuration of the electrode assembly
  • the secondary battery is also described in an embodiment of the present invention described below.
  • the secondary battery has a structure in which an electrode assembly and an electrolyte are accommodated and enclosed in an exterior body.
  • the “secondary battery” refers to a battery that can be repeatedly charged and discharged. Therefore, the secondary battery of the present invention is not excessively bound by its name, and for example, “electric storage device” can also be included in the subject of the present invention.
  • the electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. Examples of the type of electrode assembly include the following types.
  • the electrode assembly 10A has a planar stacked structure in which a plurality of unit electrode units including positive electrodes 1 and 1A, negative electrodes 2 and 2A, and separators 3 and 3A are stacked (see FIG. 9).
  • the electrode assembly 10B has a winding structure in which electrode units including the positive electrodes 1 and 1B, the negative electrodes 2 and 2B, and the separators 3 and 3B are wound in a roll shape (see FIG. 10). ).
  • the electrode assembly is formed by folding a positive electrode, a negative electrode, a separator, and a negative electrode unit (particularly preferably an electrode unit (laminate) extending long in one direction). It may have a stack and fold structure.
  • the exterior body may take the form of a conductive hard case or a flexible case (such as a pouch).
  • a flexible case such as a pouch
  • each of the plurality of positive electrodes is connected to the positive electrode external terminal via the positive electrode current collecting lead.
  • the external terminal for positive electrode is fixed to the exterior body by a seal portion, and the seal portion prevents electrolyte leakage.
  • each of the plurality of negative electrodes is connected to a negative electrode external terminal via a negative electrode current collecting lead.
  • the external terminal for negative electrode is fixed to the exterior body by a seal portion, and the seal portion prevents electrolyte leakage.
  • the present invention is not limited thereto, and the positive electrode current collector lead connected to each of the plurality of positive electrodes may have the function of a positive electrode external terminal, and the negative electrode current collector connected to each of the plurality of negative electrodes.
  • the lead may have a function of an external terminal for negative electrode.
  • each of the plurality of positive electrodes is connected to a positive electrode external terminal via a positive electrode current collecting lead.
  • the external terminal for positive electrode is fixed to the exterior body by a seal portion, and the seal portion prevents electrolyte leakage.
  • the positive electrode 1 is composed of at least a positive electrode current collector 11 and a positive electrode material layer 12 (see FIG. 11), and a positive electrode material layer 12 is provided on at least one surface of the positive electrode current collector 11.
  • a positive electrode side extraction tab 13 is positioned at a portion of the positive electrode current collector 11 where the positive electrode material layer 12 is not provided, that is, at an end of the positive electrode current collector 11.
  • the positive electrode material layer 12 contains a positive electrode active material as an electrode active material.
  • the negative electrode 2 is composed of at least a negative electrode current collector 21 and a negative electrode material layer 22 (see FIG. 11), and the negative electrode current material layer 22 is provided on at least one surface of the negative electrode current collector 21.
  • a negative electrode side extraction tab 23 is positioned at a portion of the negative electrode current collector 21 where the negative electrode material layer 22 is not provided, that is, at an end of the negative electrode current collector 21.
  • the negative electrode material layer 22 contains a negative electrode active material as an electrode active material.
  • the positive electrode active material contained in the positive electrode material layer 12 and the negative electrode active material contained in the negative electrode material layer 22 are materials directly involved in the transfer of electrons in the secondary battery, and are the main positive and negative electrodes responsible for charge / discharge, that is, the battery reaction. It is a substance. More specifically, ions are brought into the electrolyte due to “the positive electrode active material contained in the positive electrode material layer 12” and “the negative electrode active material contained in the negative electrode material layer 22”, and these ions are converted into the positive electrode 1 and the negative electrode. 2 is transferred between the two and the electrons are transferred and charged and discharged.
  • the positive electrode material layer 12 and the negative electrode material layer 22 are particularly preferably layers capable of occluding and releasing lithium ions.
  • a secondary battery in which lithium ions move between the positive electrode 1 and the negative electrode 2 through the electrolyte and the battery is charged and discharged is preferable.
  • the secondary battery corresponds to a so-called “lithium ion battery”.
  • the positive electrode active material of the positive electrode material layer 12 is made of, for example, a granular material, and a binder (also referred to as a “binder”) is included in the positive electrode material layer 12 for sufficient contact between the particles and shape retention. It is preferable. Furthermore, a conductive additive may be included in the positive electrode material layer 12 to facilitate the transmission of electrons that promote the battery reaction. Similarly, the negative electrode active material of the negative electrode material layer 22 is made of, for example, a granular material, and it is preferable that a binder is included for sufficient contact and shape retention between the particles, which facilitates the transfer of electrons that promote the battery reaction. In order to do so, a conductive additive may be included in the negative electrode material layer 22. Thus, because of the form in which a plurality of components are contained, the positive electrode material layer 12 and the negative electrode material layer 22 can also be referred to as a “positive electrode mixture layer” and a “negative electrode mixture layer”, respectively.
  • the positive electrode active material is preferably a material that contributes to occlusion and release of lithium ions.
  • the positive electrode active material is preferably, for example, a lithium-containing composite oxide.
  • the positive electrode active material is preferably a lithium transition metal composite oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese, and iron. That is, in the positive electrode material layer 12 of the secondary battery, such a lithium transition metal composite oxide is preferably included as a positive electrode active material.
  • the positive electrode active material may be lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate, or a part of those transition metals replaced with another metal. Although such a positive electrode active material may be included as a single species, two or more types may be included in combination.
  • the positive electrode active material contained in the positive electrode material layer 12 is lithium cobalt oxide.
  • the binder that can be included in the positive electrode material layer 12 is not particularly limited, but poly (vinylidene fluoride), vinylidene fluoride-hexafluoropropylene copolymer, and vinylidene fluoride-tetrafluoroethylene copolymer. And at least one selected from the group consisting of polytetrafluoroethylene and the like.
  • the conductive additive that can be included in the positive electrode material layer 12 is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and gas phase.
  • the binder of the positive electrode material layer 12 may be polyvinylidene fluoride.
  • the conductive support agent of the positive electrode material layer 12 is carbon black.
  • the binder and conductive additive of the positive electrode material layer 12 may be a combination of polyvinylidene fluoride and carbon black.
  • the negative electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the negative electrode active material is preferably, for example, various carbon materials, oxides, or lithium alloys.
  • Examples of various carbon materials of the negative electrode active material include graphite (natural graphite, artificial graphite), hard carbon, soft carbon, diamond-like carbon, and the like.
  • graphite is preferable in that it has high electron conductivity and excellent adhesion to the negative electrode current collector 21.
  • Examples of the oxide of the negative electrode active material include at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide, and the like.
  • the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium.
  • Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn It may be a binary, ternary or higher alloy of a metal such as La and lithium.
  • Such an oxide is preferably amorphous in its structural form. This is because deterioration due to non-uniformity such as crystal grain boundaries or defects is less likely to be caused.
  • the negative electrode active material of the negative electrode material layer 22 may be artificial graphite.
  • the binder that can be included in the negative electrode material layer 22 is not particularly limited, but is at least one selected from the group consisting of styrene butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide resin, and polyamideimide resin. Species can be mentioned.
  • the binder contained in the negative electrode material layer 22 may be styrene butadiene rubber.
  • the conductive aid that can be included in the negative electrode material layer 22 is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and gas phase.
  • the component resulting from the thickener component for example, carboxymethylcellulose used at the time of battery manufacture may be contained in the negative electrode material layer 22.
  • the negative electrode active material and binder in the negative electrode material layer 22 may be a combination of artificial graphite and styrene butadiene rubber.
  • the positive electrode current collector 11 and the negative electrode current collector 21 used for the positive electrode 1 and the negative electrode 2 are members that contribute to collecting and supplying electrons generated in the active material due to the battery reaction.
  • a current collector may be a sheet-like metal member and may have a porous or perforated form.
  • the current collector may be a metal foil, a punching metal, a net or an expanded metal.
  • the positive electrode current collector 11 used for the positive electrode 1 is preferably made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel and the like, and may be, for example, an aluminum foil.
  • the negative electrode current collector 21 used for the negative electrode 2 is preferably made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel and the like, and may be, for example, a copper foil.
  • the separator 3 used for the positive electrode 1 and the negative electrode 2 is a member provided from the viewpoints of preventing short circuit due to contact between the positive and negative electrodes and holding the electrolyte.
  • the separator 3 can be said to be a member that allows ions to pass through while preventing electronic contact between the positive electrode 1 and the negative electrode 2.
  • the separator 3 is a porous or microporous insulating member and has a film form due to its small thickness.
  • a polyolefin microporous film may be used as the separator.
  • the microporous film used as the separator 3 may include, for example, only polyethylene (PE) or only polypropylene (PP) as the polyolefin.
  • the separator 3 may be a laminate composed of “a microporous membrane made of PE” and “a microporous membrane made of PP”.
  • the surface of the separator 3 may be covered with an inorganic particle coat layer and / or an adhesive layer.
  • the surface of the separator may have adhesiveness.
  • the separator 3 is not particularly restricted by its name, and may be a solid electrolyte, a gel electrolyte, insulating inorganic particles or the like having the same function.
  • it is preferable that the separator 3 and the electrode (positive electrode 1 / negative electrode 2) are bonded from the viewpoint of further improving the handling of the electrode.
  • the separator 3 and the electrode are bonded by using an adhesive separator as the separator 3, applying an adhesive binder on the electrode material layer (positive electrode material layer 12 / negative electrode material layer 22) and / or thermocompression bonding, or the like. Can be done.
  • the adhesive that provides adhesion to the separator 3 or the electrode material layer include polyvinylidene fluoride and an acrylic adhesive.
  • the electrolyte is preferably a “non-aqueous” electrolyte such as an organic electrolyte and / or an organic solvent (that is, the electrolyte is a non-aqueous electrolyte).
  • the electrolyte metal ions released from the electrodes (the positive electrode 1 and the negative electrode 2) exist, and therefore the electrolyte assists the movement of the metal ions in the battery reaction.
  • a non-aqueous electrolyte is an electrolyte containing a solvent and a solute.
  • a solvent containing at least carbonate is preferable.
  • Such carbonates may be cyclic carbonates and / or chain carbonates.
  • examples of the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), and vinylene carbonate (VC). be able to.
  • chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dipropyl carbonate (DPC).
  • DMC dimethyl carbonate
  • DEC diethyl carbonate
  • EMC ethyl methyl carbonate
  • DPC dipropyl carbonate
  • the combination of cyclic carbonate and chain carbonate is used as a nonaqueous electrolyte, for example, the mixture of ethylene carbonate and diethyl carbonate may be used.
  • a Li salt such as LiPF 6 or LiBF 4
  • a Li salt such as LiPF 6 and / or LiBF 4 is preferably used.
  • any current collecting lead used in the field of secondary batteries can be used.
  • a current collecting lead may be made of a material that can achieve electron movement, and is made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
  • the positive electrode current collector lead is preferably composed of aluminum, and the negative electrode current collector lead is preferably composed of nickel.
  • the form of the positive electrode current collector lead and the negative electrode current collector lead is not particularly limited, and may be, for example, a wire or a plate.
  • any external terminal used in the field of secondary batteries can be used.
  • Such an external terminal may be made of a material capable of achieving electron movement, and is usually made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
  • the external terminal 5 may be electrically and directly connected to the substrate, or may be electrically and indirectly connected to the substrate via another device.
  • the present invention is not limited to this, and the positive electrode current collecting lead electrically connected to each of the plurality of positive electrodes may have the function of the positive electrode external terminal, and electrically connected to each of the plurality of negative electrodes.
  • the negative electrode current collecting lead may have the function of the negative electrode external terminal.
  • the exterior body may have the form of a conductive hard case or a flexible case (such as a pouch) as described above.
  • the conductive hard case consists of a main body and a lid.
  • a main-body part consists of the bottom part and side part which comprise the bottom face of the said exterior body.
  • the main body and the lid are sealed after the electrode assembly, the electrolyte, the current collecting lead, and the external terminal are accommodated.
  • the sealing method is not particularly limited, and examples thereof include a laser irradiation method.
  • a material constituting the main body part and the lid part any material capable of constituting a hard case type exterior body in the field of secondary batteries can be used.
  • Such a material may be any material that can achieve electron transfer, and examples thereof include conductive materials such as aluminum, nickel, iron, copper, and stainless steel.
  • the dimensions of the main body and the lid are mainly determined according to the dimensions of the electrode assembly.
  • the dimensions are such that the electrode assembly is prevented from moving (displacement) within the exterior body. It is preferable to have. By preventing the movement of the electrode assembly, the electrode assembly is prevented from being destroyed, and the safety of the secondary battery is improved.
  • the flexible case is composed of a soft sheet.
  • the soft sheet only needs to have a degree of softness that can achieve bending of the seal portion, and is preferably a plastic sheet.
  • the plastic sheet is a sheet having a characteristic that the deformation due to the external force is maintained when the external sheet is applied and then removed.
  • a so-called laminate film can be used.
  • a flexible pouch made of a laminate film can be produced, for example, by laminating two laminate films and heat-sealing the peripheral edge.
  • the laminate film a film obtained by laminating a metal foil and a polymer film is generally used. Specifically, a film having a three-layer structure including an outer layer polymer film / metal foil / inner layer polymer film is exemplified.
  • the outer layer polymer film is for preventing damage to the metal foil due to permeation and contact of moisture and the like, and polymers such as polyamide and polyester can be suitably used.
  • the metal foil is for preventing the permeation of moisture and gas, and a foil of copper, aluminum, stainless steel or the like can be suitably used.
  • the inner layer polymer film is for protecting the metal foil from the electrolyte accommodated therein, and for melting and sealing at the time of heat sealing, and polyolefin or acid-modified polyolefin can be suitably used.
  • Secondary battery of the present invention A secondary battery according to an embodiment of the present invention will be described below in consideration of the basic configuration of the secondary battery. Note that the secondary battery according to an embodiment of the present invention is preliminarily assumed to be a secondary battery having a step structure.
  • FIG. 1 is a perspective view schematically showing a secondary battery according to an embodiment of the present invention.
  • a secondary battery 100 has a structure in which an electrode assembly and an electrolyte are accommodated and enclosed in an exterior body 20.
  • the exterior body 20 includes at least two steps that are continuous with each other and have different height levels on the upper surface.
  • the exterior body 20 may include at least two step portions (a first step portion 20 a and a second step portion 20 b). Specifically, the first step portion 20a and a second stepped portion 20b, the height h 2 of the top surface 20b 1 of each other in succession and the second step portion 20b of the top surface 20a 1 of the first step portion 20a High It is configured to be larger than the length h 1 .
  • a top surface 20a 1 of the first step portion 20a of the second step portion 20b A step surface 20b 2 is formed between the upper surface 20b 1 .
  • the first step portion 20a and a second stepped portion 20b, the width W 2 of the upper surface 20b 1 of the second step portion 20b (longitudinal direction) of the top surface 20a 1 of the first step portion 20a width W 1 is configured to be equal to (the longitudinal direction).
  • the step surface 20b 2 has a height h 3 and a width dimension (longitudinal direction) W 3 .
  • the height h 3 of the step surface 20b 2 is equal to the difference between the height h 2 of the upper surface 20b 1 of the second step portion 20b and the height h 1 of the upper surface 20a 1 of the first step portion 20a.
  • the width W 3 of the stepped surface 20b 2 (longitudinal direction), a width dimension W 2 of the upper surface 20b 1 of the second step portion 20b (longitudinal direction) and the width W 1 of the top surface 20a 1 of the first step portion 20a ( In the longitudinal direction).
  • the step surface 20b 2 is configured to be continuous with the upper surface 20a 1 of the first step portion 20a.
  • the upper surface 20a 1 of the first step portion 20a is continuous with the stepped surface 20b 2 so as to extend in different directions with respect to the extending direction of the step surface 20b 2.
  • the top surface 20a 1 of the first step portion 20a may not extend in a direction perpendicular to the extending direction of the step surface 20b 2.
  • the angle between the step surface 20b 2 and the upper surface 20a 1 of the first step portion 20a theta may have a 90 °.
  • the angle ⁇ between the step surface 20b 2 and the upper surface 20a 1 of the first stepped portion 20a may be 30 to 150 degrees in consideration of the arrangement of the substrates, The angle is preferably 50 ° to 130 °, more preferably 70 ° to 110 °.
  • the outer body and thus comprises a stepped structure formed between the top surface 20a 1 of the stepped surface and the first step portion 20a.
  • the step structure, the spatial region on the top surface 20a 1 of the concrete first step portion 20a is preferably provided with a substrate from the viewpoint of efficient use of such areas.
  • the above-described substrate may be a so-called rigid substrate or a flexible substrate, and is preferably a rigid substrate.
  • any rigid substrate used in the field of substrates used with secondary batteries can be used, and examples thereof include a glass / epoxy resin substrate.
  • the substrate include a circuit board such as a printed circuit board and a protection circuit board, a semiconductor substrate such as a silicon wafer, and a glass substrate such as a display panel.
  • a secondary battery pack is constituted by the protection circuit board and the secondary battery.
  • external terminals 30 for the secondary battery are provided on the surface of the outer package 20.
  • an external terminal 30 may be configured so as to be exposed to the side surface 20a 2 of the first step portion 20a.
  • the exterior body which is a component of the secondary battery according to the embodiment of the present invention, includes at least two step portions (a lower step portion having a relatively low upper surface height and an upper surface continuous with the lower step portion.
  • the electrode assembly disposed in the exterior body having the step structure is substantially the same as the exterior body in a sectional view from the viewpoint of preventing the electrode assembly from moving (displacement) in the exterior body. It is preferable to have a stepped structure.
  • the content described below is merely an example, and it is confirmed that it is assumed that the electrode assembly is provided inside an exterior body having two steps.
  • the electrode assembly which is a component of the secondary battery includes the positive electrode, the negative electrode, and the separator disposed between the positive electrode and the negative electrode as described above.
  • Examples of the type of electrode assembly include the following types.
  • the electrode assembly 10A is formed by laminating a plurality of unit electrode units including the positive electrodes 1 and 1A, the negative electrodes 2 and 2A, and the separators 3 and 3A (see FIG. 9).
  • the second type (winding structure type) is an electrode assembly 10B in which an electrode unit including positive electrodes 1 and 1B, negative electrodes 2 and 2B, and separators 3 and 3B is wound in a roll shape (FIG. 10). reference).
  • the electrode assembly is formed by folding a positive electrode, a negative electrode, a separator, and a negative electrode unit (particularly preferably an electrode unit (laminate) extending long in one direction). It may have a stack and fold structure.
  • the electrode assembly 10 may comprise at least two planar stacked sub-electrode assemblies (see FIG. 2).
  • the electrode assembly 10 may comprise a first planar layered structure type sub-electrode assembly 10A 1 and the second planar layered structure type sub-electrode assembly 10A 2.
  • the first planar layered structure type sub-electrode assembly 10A 1 is to the positive electrode 1A 1, the unit electrode unit including a negative electrode 2A 1, and the separator 3A 1 are stacked.
  • the second planar layered structure type sub-electrode assembly 10A 2 are those unit electrode unit including the positive electrode 1A 2, the negative electrode 2A 2, and the separator 3A 2 are stacked.
  • the electrode assembly 10 in the electrode assembly 10, the second planar layered structure type sub-electrode assembly 10A 2, the first planar layered structure type sub-electrode assembly 10A in cross section as shown in FIG. 2 has a larger width than the first width dimension, and in contact with the first planar layered structure type sub-electrode assembly 10A 1 and each other as to be positioned below the first planar layered structure type sub-electrode assembly 10A 1 It may be.
  • the electrode assembly 10 can have a step structure in a cross-sectional view.
  • connection tab in this specification refers to a portion corresponding to an uncoated portion of an electrode (positive electrode / negative electrode) that is not bonded to a current collecting lead.
  • the “connecting portion” in the present specification refers to one configured such that each of a plurality of connection tabs can be connected to each other.
  • the “drawer tab” in this specification refers to a portion corresponding to an uncoated portion of an electrode (positive electrode / negative electrode) and bonded to a current collecting lead.
  • drawer portion in the present specification refers to one configured such that each of a plurality of drawer tabs can be connected to each other.
  • the electrode assembly 10 having the step structure is, as shown in FIG. 3, the first region 10 ⁇ / b> X having a relatively high height in a sectional view (component of the electrode assembly 10). And a second region 10Y (a component of the electrode assembly 10) adjacent to the first region 10X and having a relatively low height.
  • adjacent means not only a state in which the first region 10X and the second region 10Y, which are components of a single electrode assembly, are continuous but also one electrode assembly that functions as a separate component. It refers to one that can include a state in which (corresponding to the first region) and the other electrode assembly (corresponding to the second region) are continuous.
  • each of the positive electrode and the negative electrode in the second region 10Y and the first region 10X may be adjacent to each other.
  • the positive electrode side connection tabs 13X included in the “partial” positive electrodes of the plurality of positive electrodes composed of the positive electrode 1A 2 and the positive electrode side connection tabs 13X are joined to each other, as shown in FIG.
  • a connecting portion 14X is formed.
  • the positive electrode side connection portion 14X is formed, for example, by joining the end portions of the plurality of positive electrode side connection tabs 13X so as to form a bundle as a whole as shown in FIG. Although it does not specifically limit as a joining method, Laser welding, ultrasonic welding, etc. are mentioned.
  • Each of the negative electrode side connection tabs 23X included in each “part” negative electrode of the plurality of negative electrodes composed of 2A 2 is joined to each other, whereby the negative electrode side connection portion 24X as shown in FIG. Is formed.
  • the negative electrode side connection portion 24X is formed, for example, by joining the end portions of the plurality of negative electrode side connection tabs 23X so as to form a bundle as a whole as shown in FIG. Although it does not specifically limit as a joining method, Laser welding, ultrasonic welding, etc. are mentioned.
  • the positive electrode side extraction portion 14 ⁇ / b> Y is formed by joining the ends of the positive electrode side extraction tabs 13 ⁇ / b> Y so as to form a bundle as a whole.
  • a joining method Laser welding, ultrasonic welding, etc. are mentioned.
  • a part of the positive electrode extraction tab 13Y in the formation region of the positive electrode extraction portion 14Y may be configured to be electrically connected to the external terminal 30a via the positive electrode current collecting lead 40a.
  • the present invention is not limited to this, and on the premise that the positive electrode side extraction portion 14Y is formed, a part of the positive electrode side extraction tab 13Y in the other region other than the formation region of the positive electrode side extraction portion 14Y is formed on the positive electrode side.
  • a part of the positive electrode side extraction tab 13Y is not limited to being connected to the external terminal 30a via the positive electrode side current collecting lead 40a.
  • a part of the positive electrode side extraction tab 13Y may be connected to a positive electrode side current collecting lead having a function of an external terminal.
  • each of the second negative electrode side lead tab of the negative electrode 2A 2 planar laminated structure type sub-electrode assembly 10A 2 23Y is mutually as By joining, the negative electrode side lead portion 24Y is formed.
  • the negative electrode side extraction portion 24Y is formed by joining the ends of the negative electrode side extraction tabs 23Y so as to form a bundle as a whole as shown in FIG. 7, for example.
  • a joining method Laser welding, ultrasonic welding, etc. are mentioned.
  • a part of the negative electrode side extraction tab 23Y in the formation region of the negative electrode side extraction portion 24Y may be configured to be electrically connected to the external terminal 30b via the negative electrode side current collecting lead 40b.
  • the negative electrode side lead section part of the negative electrode side lead tab 23Y in the formation region of the 24Y is "provided on the side surface 20a 2 of the first step portion 20a" via the negative electrode side current collector lead 40b external terminals 30b electrically May be connected.
  • the present invention is not limited to this, and on the premise that the negative electrode side extraction portion 24Y is formed, a part of the negative electrode side extraction tab 23Y in a region other than the formation region of the negative electrode side extraction portion 24Y is on the negative electrode side.
  • a part of the negative electrode side extraction tab 23Y is not limited to being connected to the external terminal 30b through the negative electrode side current collecting lead 40b.
  • a part of the negative electrode side extraction tab 23Y may be connected to a negative electrode side current collecting lead having a function of an external terminal.
  • At least one positive electrode 1A 2 located in the second region 10Y is located in the first region 10X. there needs to be configured so as to be electrically connected to each other and one at least one of the positive electrode 1A.
  • at least one positive electrode needs to include both the positive electrode side connection tab 13X and the positive electrode side extraction tab 13Y in a plan view. There is. Similarly, as shown in FIG.
  • the negative electrode 2A 2 at least one positioned in the second region 10Y is positioned in the first region 10X at least one of the negative electrode 2A 1 mutually are required to be configured to be electrically connected to.
  • at least one negative electrode needs to include both the negative electrode side connection tab 23X and the negative electrode side extraction tab 23Y in a plan view. There is.
  • the positive lead-out portion 14Y in the second region 10Y can be electrically connected to the external terminal 30a through the positive current collecting lead 40a.
  • the negative electrode side lead portion 24Y in the second region 10Y can be electrically connected to the external terminal 30b through the negative electrode side current collecting lead 40b.
  • the external terminal is connected to the second step portion 20b of the exterior body 20.
  • An external terminal can be provided not on the side but on the first step portion 20a side. From the above, in one embodiment of the present invention, it can be avoided that the installation location of the external terminal is limited to the second step portion 20b side of the exterior body 20. That is, in one embodiment of the present invention, the degree of freedom of installation of the external terminals can be increased.
  • the positive electrode side extraction tab 13Y when the positive electrode side extraction tab 13Y can be electrically connected to a single positive electrode side external terminal 30a via the positive electrode side current collecting lead 40a, the positive electrode side external terminal 30a.
  • the number of wirings that connect the circuit board and the substrate can be only one. Therefore, it is possible to suppress the complexity of the wiring structure that may occur when a plurality of positive electrode side external terminals are used. In other words, the wiring structure that connects the positive external terminal 30a and the substrate can be simplified. Similarly, for example, as shown in FIGS.
  • the negative electrode side extraction tab 23Y when the negative electrode side extraction tab 23Y can be electrically connected to the single negative electrode side external terminal 30b via the negative electrode side current collecting lead 40b, the negative electrode side
  • the number of wirings connecting the external terminal 30b and the substrate can be only one. Therefore, it is possible to suppress the complexity of the wiring structure that may occur when a plurality of negative electrode-side external terminals are used. In other words, the wiring structure that connects the negative electrode side external terminal 30b and the substrate can be simplified.
  • the positive electrode side connecting portion 14X and the negative electrode side connecting portion 24X, and the positive electrode side leading portion 14Y and the negative electrode side leading portion 24Y are provided only on one side in the exterior body 20. It is preferable that they are configured to be arranged respectively.
  • the positive electrode side connection portion 14X and the positive electrode side lead portion 14Y are disposed on one side of the electrode assembly 10, while the negative electrode side connection portion 24X and the negative electrode side lead portion 24Y are disposed on the electrode assembly 10.
  • the negative electrode side connection portion 24X and the negative electrode side lead portion 24Y are not present on the other side of the electrode assembly 10.
  • the width dimension of the electrode assembly 10 can be made relatively small. Therefore, due to the relative reduction of the width dimension of the electrode assembly 10, the dimension of the exterior body 20 that houses the electrode assembly 10 can be made relatively small. That is, the size of the secondary battery 100 according to the embodiment of the present invention can be relatively reduced.
  • the positive electrode side connection portion 14X all the positive electrodes are connected to each other via the respective positive electrode side connection tabs 13X, and by forming the negative electrode side connection portion 24X, all of the positive electrode side connection tabs 23X are formed.
  • the negative electrodes may be connected to each other. In this case, since all the positive electrodes are connected to each other by the single positive electrode side connecting portion 14X, it is possible to stabilize the electrical connection between the positive electrodes.
  • the electrode assembly 10 including first planar layered structure type sub-electrode assembly 10A 1 and the second planar layered structure type sub-electrode assembly 10A 2, without being limited thereto, the electrodes If the assembly has a step structure in cross-sectional view, the following mode may be adopted.
  • an electrode assembly 10 ′ including a planar stacked structure type sub-electrode assembly and a wound structure type sub-electrode assembly may be adopted.
  • the planar laminated structure type sub-electrode assembly 10A 1 ′ is obtained by laminating a plurality of unit electrode units including a positive electrode 1A 1 ′, a negative electrode 2A 1 ′, and separators 3A 1 ′.
  • the wound structure type sub-electrode assembly 10B 1 ′ is obtained by winding an electrode unit including a positive electrode 1B 1 ′, a negative electrode 2B 1 ′, and a separator 3B 1 ′ in a roll shape.
  • the width of the planar laminate structure-type sub-electrode assembly 10A 1 in cross-section view as shown in FIG. 8 It has a greater width dimension than the dimension, and may be in contact with the planar laminate structure-type sub-electrode assembly 10A 1 and each other as to be positioned below the planar laminate structure-type sub-electrode assembly 10A 1.
  • planar stacked structure type sub-electrode assembly has a width dimension larger than the width dimension of the wound structure type sub-electrode assembly in a sectional view, and
  • the winding structure type sub-electrode assembly may be in contact with each other so as to be positioned below the winding structure type sub-electrode assembly.
  • the electrode assembly may include at least two wound structure type sub-electrode assemblies (not shown).
  • the electrode assembly may include a first winding structure type sub-electrode assembly and a second winding structure type sub-electrode assembly. Both the first winding structure type sub-electrode assembly and the second winding structure type sub-electrode assembly are obtained by winding an electrode unit including a positive electrode, a negative electrode, and a separator in a roll shape.
  • the second winding structure type sub-electrode assembly has a width dimension larger than the width dimension of the first winding structure type sub-electrode assembly in a sectional view. And may be in contact with the first winding structure type sub-electrode assembly so as to be positioned below the first winding structure type sub-electrode assembly.
  • an electrode assembly is a level
  • the characteristic configuration from the following two viewpoints Is preferably adopted.
  • Each of the positive electrode side connection tabs included in the positive electrode constituted by the positive electrode 1B 1 ′ of the wound structure type sub-electrode assembly 10B 1 ′ is connected to each other by forming a positive electrode side connection portion. Is preferred.
  • the positive electrode side extraction tab included in the positive electrode 1B 1 ′ of the wound structure type sub electrode assembly 10B 1 ′ in the second region having a relatively low height of the electrode assembly 10 ′ has a positive electrode side collecting tab.
  • the negative electrode 2A 1 ′ of the planar stacked sub-electrode assembly 10A 1 ′ in the first region having a relatively high height of the electrode assembly 10 ′ in a cross-sectional view, and the winding in the first region It is preferable that the negative electrode side connection tabs respectively included in the negative electrode constituted by the negative electrode 2B 1 ′ of the structural sub-electrode assembly 10B 1 ′ are connected to each other by forming a negative electrode side connection portion. .
  • the negative electrode side extraction tab included in the negative electrode 2B 1 ′ of the wound structure type sub electrode assembly 10B 1 ′ in the second region having a relatively low height of the electrode assembly 10 ′ has a negative electrode side collecting tab. It is preferable to be electrically connected to the negative electrode side external terminal 30b (for example, see FIG. 1) through the electric lead.
  • the electrode assembly has a characteristic configuration in an aspect (not shown) including at least two wound structure type sub-electrode assemblies having different width dimensions in cross-sectional view. Is preferably adopted. Specifically, the positive electrode of the first winding structure type sub-electrode assembly in the first region having a relatively high height of the electrode assembly in a cross-sectional view, and the second winding in the first region It is preferable that each of the positive electrode side connection tabs included in the positive electrode composed of the positive electrode of the structural type sub-electrode assembly is connected to each other by forming a positive electrode side connection portion.
  • the positive electrode extraction tab included in the positive electrode of the second winding structure type sub electrode assembly in the second region having a relatively low height is provided via the positive electrode current collecting lead. It is preferable to be electrically connected to the positive electrode side external terminal 30a (see, for example, FIG. 1).
  • the negative electrode of the first winding structure type sub-electrode assembly in the first region having a relatively high height of the electrode assembly in cross-sectional view, and the second winding structure type in the first region It is preferable that the negative electrode side connection tabs respectively included in the negative electrode constituted by the negative electrode of the sub-electrode assembly are connected to each other by forming a negative electrode side connection part.
  • the negative electrode side extraction tab included in the negative electrode of the second wound structure type sub electrode assembly in the second region having a relatively low height is provided via the negative electrode side current collecting lead. It is preferable to be electrically connected to the negative external terminal 30b (see, for example, FIG. 1).
  • the secondary battery according to an embodiment of the present invention can be used in various fields where power storage is assumed.
  • the secondary battery according to an embodiment of the present invention particularly the non-aqueous electrolyte secondary battery, is merely an example, and the electric / information / communication field (for example, a mobile phone, a smart phone, a notebook)
  • Mobile devices such as personal computers and digital cameras, activity meters, arm computers, and electronic paper
  • home and small industrial applications eg, power tools, golf carts, home, nursing and industrial robots
  • large industries Applications eg, forklifts, elevators, bay harbor cranes
  • transportation systems eg, hybrid vehicles, electric vehicles, buses, trains, electric assist bicycles, electric motorcycles
  • power system applications eg, various power generation
  • IoT field space and deep sea applications (for example, spacecraft, areas such as submersible research vessel) and the like.

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  • Electrochemistry (AREA)
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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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  • Connection Of Batteries Or Terminals (AREA)
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Abstract

Un mode de réalisation de la présente invention concerne une cellule secondaire 100 logeant, dans un boîtier externe 20, un électrolyte et un ensemble d'électrodes 10 qui comprend des électrodes positives 1, des électrodes négatives 2, et des séparateurs 3 disposés entre chaque électrode positive 1 et électrode négative 2, dans lequel : l'ensemble d'électrodes 10 comprend une structure étagée comprenant, dans une vue en coupe transversale, une première région 10X ayant une hauteur relativement élevée et une seconde région 10Y adjacente à la première région 10X et ayant une hauteur relativement basse; l'ensemble d'électrodes 10 ayant la structure étagée comprend une partie de connexion côté électrode positive 14X pour connecter ensemble les languettes de connecteur côté électrode positive 13X pour une partie des électrodes positives 1A1 à l'intérieur de la première région 10X, et/ou une partie de connexion côté électrode négative 24X pour connecter ensemble les languettes de connecteur côté électrode négative 23X pour une partie des électrodes négatives 2A1 à l'intérieur de la première région 10X; et une partie de sortie côté électrode positive 14Y connectant ensemble les languettes de sortie côté électrode positive 13Y d'au moins deux des électrodes positives 1A2 et/ou une partie de sortie côté électrode négative 24Y connectant ensemble les languettes de sortie côté électrode négative 23Y d'au moins deux des électrodes négatives 2A2 à l'intérieur de la seconde région 10Y est configurée de façon à se connecter électriquement à une borne externe 30.
PCT/JP2017/045558 2017-01-12 2017-12-19 Cellule secondaire WO2018131398A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008066170A (ja) * 2006-09-08 2008-03-21 Nec Tokin Corp 積層型電池の製造方法
JP2014521197A (ja) * 2011-07-13 2014-08-25 エルジー・ケム・リミテッド 連結信頼性の向上した電池モジュール及びこれを備えた中大型電池パック
JP2014526133A (ja) * 2012-05-31 2014-10-02 エルジー・ケム・リミテッド 段差を有する電極組立体、それを含む電池セル、電池パック及びデバイス
JP2015115261A (ja) * 2013-12-13 2015-06-22 三洋電機株式会社 密閉型電池
JP2015518256A (ja) * 2012-05-07 2015-06-25 エルジー ケム． エルティーディ． 非定型構造の電池セル及びそれを含む電池モジュール
JP2016502743A (ja) * 2013-02-13 2016-01-28 エルジー・ケム・リミテッド 安全性が向上した新規な構造の電池セル

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2971893B2 (ja) * 1989-07-28 1999-11-08 旭光学工業株式会社 組電池装置
JP3611765B2 (ja) * 1999-12-09 2005-01-19 シャープ株式会社 二次電池及びそれを用いた電子機器
US20060188777A1 (en) 2003-07-31 2006-08-24 Hiroshi Kaneta Lithium ion secondary cell
CN101529613B (zh) * 2006-08-21 2012-06-13 株式会社Lg化学 具有改进的安全性及优良制造工艺特性的袋形二次电池
US8574753B2 (en) * 2009-08-27 2013-11-05 Kabushiki Kaisha Toshiba Battery comprising a conductive nipping member
CN103875120B (zh) * 2011-09-30 2016-05-25 株式会社村田制作所 电池收纳结构体
JP5909985B2 (ja) * 2011-10-17 2016-04-27 ソニー株式会社 電池および電池の製造方法ならびに電池パック、電子機器、電動車両、蓄電装置および電力システム
KR20130113301A (ko) 2012-04-05 2013-10-15 주식회사 엘지화학 계단 구조의 전지셀
KR20130118716A (ko) * 2012-04-20 2013-10-30 주식회사 엘지화학 전극 조립체, 이를 포함하는 전지셀 및 디바이스
WO2013168980A1 (fr) * 2012-05-07 2013-11-14 주식회사 엘지화학 Bloc-batterie à structure amorphe
KR20130132231A (ko) * 2012-05-25 2013-12-04 주식회사 엘지화학 단차를 갖는 전극 조립체 및 이를 포함하는 전지셀, 전지팩 및 디바이스
KR101385732B1 (ko) * 2012-11-22 2014-04-17 주식회사 엘지화학 전장의 길이가 동일하고 전폭의 길이가 상이한 전극 유닛들로 이루어진 전극 조립체, 이를 포함하는 전지셀 및 디바이스
KR101387424B1 (ko) * 2012-11-22 2014-04-25 주식회사 엘지화학 전폭의 길이가 동일하고 전장의 길이가 상이한 전극 유닛들로 이루어진 전극 조립체, 이를 포함하는 전지셀 및 디바이스
KR101482837B1 (ko) * 2013-02-08 2015-01-20 주식회사 엘지화학 스텝 유닛셀을 포함하는 단차를 갖는 전극 조립체
KR101573691B1 (ko) * 2013-03-04 2015-12-03 주식회사 엘지화학 결락부가 형성된 전지셀 및 이를 포함하는 전지팩
KR101572836B1 (ko) * 2013-03-04 2015-12-01 주식회사 엘지화학 단차 구조를 포함하는 전지셀
KR101870314B1 (ko) * 2015-04-16 2018-06-22 주식회사 엘지화학 전극 탭들과 전극 리드의 탭-리드 결합부가 공간부에 위치하는 전극조립체

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008066170A (ja) * 2006-09-08 2008-03-21 Nec Tokin Corp 積層型電池の製造方法
JP2014521197A (ja) * 2011-07-13 2014-08-25 エルジー・ケム・リミテッド 連結信頼性の向上した電池モジュール及びこれを備えた中大型電池パック
JP2015518256A (ja) * 2012-05-07 2015-06-25 エルジー ケム． エルティーディ． 非定型構造の電池セル及びそれを含む電池モジュール
JP2014526133A (ja) * 2012-05-31 2014-10-02 エルジー・ケム・リミテッド 段差を有する電極組立体、それを含む電池セル、電池パック及びデバイス
JP2016502743A (ja) * 2013-02-13 2016-01-28 エルジー・ケム・リミテッド 安全性が向上した新規な構造の電池セル
JP2015115261A (ja) * 2013-12-13 2015-06-22 三洋電機株式会社 密閉型電池

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